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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d8752afbf62b24c3790ea79e8a8e116ae610b5ca8cd4eb030b0b0b0e71a133' 
  AND token = 'BVexxrQtaJSeAhz/wAc0Fu9mUKoFkJWxQagO2JXbFeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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