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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e714d13be7a465c5fe70747676df6703fc5faa12f141e39f3bee22f3e6a062' 
  AND token = 'h2rIUDQhDSMF7ZL3QKafOhx5+jg+Yuo1+sumYT/7AG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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