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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d36429c24e43ec19851da9fab4be446ed8f02b1b95c99aa7d5a1e86194a3eba' 
  AND token = 'RZWHI0vvgNxrxc9kDO1CEv9/5u/FmO0dbuXaOERucE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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