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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57645ad503f35b03fe134bc1f7d813c499c88e2db17da4fc90afc4e3a394dfd3' 
  AND token = 'YgBQ9yImzFT8ChzjJ9W5kiWYWKm9vkrMmN2eFqasW5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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