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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caebf01ef7a9ee6cf6a5c7c49251ac42fe7c11fe1898d35b7a2c77c123cd1ad7' 
  AND token = '/N4URl1b/PswecyoPEGweb6SnHASGR0ar+CwtzR0+IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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