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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23b5d815c927873d03ecd867a51ba962f1bf14f3cd45f509d67c59082b0ea74' 
  AND token = 'kUalJ6WpLLnUtaZSJMiRxRSyJGyFHL+NH3g/FLKk0FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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