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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de19fcc514f99cb2aa36ed00e05a77f644b5da75705fd6e7fe1adc7ed1a1ffca' 
  AND token = 'G4W84A/Ldo49oaNbNPrwlAGgMJwz5SaOrbVODedKe1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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