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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5a08990921c06567df3bd3d03489c6add16bf4f829a03b0679faf68f647049' 
  AND token = 'CuhJycMdZYZ95b0Cu3AebJ2dHFXNngE5gxTeyPHz29c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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