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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac681d4adf0475a862583fc4791c31263a6acbaf52dbc45256dd933465e82803' 
  AND token = 'SET8nxeU+CNA/YEPzt/IHtQH4g7RbO2UEu/O0KWls0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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