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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd04efd5bd5c2d5459bafc58b489dbc354f967087f549298a1447001987041db' 
  AND token = 'ncvF5NQOGMUpUhhzLNp/ftWoKv7/RrWTgsn7OKITF2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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