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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e74c6767d7526caccb0970dcf2dcad4432b6bb8f72d5144e2d7cf4695aa70f' 
  AND token = 'IU94cg0baR5wJbEHV8seecsfdTQGlDvT9fmeG0mnGwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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