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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be29b69ed94962b16ef5bb15c04765667ac505206e21cdc4e52d17bc00e48556' 
  AND token = 'YFdDJonv6aTfvkSga8kj2Wx12ax0DMiCfhevC0e3qaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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