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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a1339499a4ceef8ab90c820b6663bec764a57dea17d0834c07f92bdd423d50' 
  AND token = 'gwitwP1F9Nv9q6o9wvmqn3VqoEyX2BRwydx0pztxXuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}