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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc4efd92495077fd9421c0372599bc7dc0f191c28f22beb89719c7e27b13fb3' 
  AND token = 'BfXTVn6FtALTF1pq8cLGRYlYa5BN+ZgDEWlB+H4dWHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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