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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134c7d88a5046477640979872ebb297e39bf91b4db6f07818fc644fe86eab69e' 
  AND token = 'nL8eirqon9/60Ac9fQaQMvlbau+ZOv1/W62ZpZIMAXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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