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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7fdf5c10aeebb2c51a9d807c93f5d6c350a90911ca44d81439631af1604f24' 
  AND token = '/I3ZDc+Rac8jBPXHZabtb2wI9cHyCA8025Y8DQbZvE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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