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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9ee0d3460dd18ed03c50a7c13f497149660e20560d05b3fcdf0cc587b89990' 
  AND token = '9e5+7iKFPHcvJVgW9F/evhk3AxJwKA8Jwc9Vh0Z119I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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