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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7976c9ff7e97d1c335a562c8461d34796ccc1e3cbfa486facd99d2ff15f366' 
  AND token = 'vDmlVvdQplUPe5xDG/4WpfS3Uhj840WnXsMIpKZIlcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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