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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ed74520dc82932a0b96f2dcdb2aa51b5d2627f06ede92bf812fecb94c64953' 
  AND token = '+RfZbDct3rfM2ABZImej1u4pGVQz+cOdqZIaEvNHqDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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