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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba049e5d539f37468778e5778eb5a17b6301db9a427fa87a623c915e80e5fdc' 
  AND token = 'kMyIDWtfqmRHV5caMIMEP6sgRDt/rnFJLKj//OSbKyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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