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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb6325ca54dc687d0e98ecf5407a6ee7cb76570ee861fd1eb7b0b9d59932ea1' 
  AND token = '1eJxjGCJQonNAd8XszJzCLKxgT8eC+jTIPb48m7QvJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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