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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1f7414ff2726ba86bdea64fbd2619e9778ba56073f362480e0067d959967d' 
  AND token = 'PTNe78DMzKKiqs1nJXrWJHdkiX8yVywV5DT9ihKLvWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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