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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495daa01ba0d764428f56c9913b1744cb7a2c75b670e2b0954469309eedbcc1b' 
  AND token = 'Q4x35fqz0WrouHRezT+rwBdV+TM4ibGGDuNfs3qcD5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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