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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff6c8871739012dbaa0a262c5576dbf26cf5cbd75b0f334e7cd759d70fc126' 
  AND token = 'mYAu+vyA/WJVKSjI5s0inDF6r7yqsZRSMsrRBl9nk0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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