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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f4d776175f6806975e905c97ed505aedbcf18e827baf8a504cb7cacb890f10' 
  AND token = 'ar4u9Z5tjRU14IWPW5QpvBy0DHgV7GRyzFrht0G/gdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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