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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc7d03e2b6d0690542f8167ce3a4aab81fa4c8d9015ed65b1c9c5f1b738aac6' 
  AND token = '6OyDvM5B4He8FIc5ii+SxR0QeVVo9k5/yTKI/qsjhZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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