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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9294bb57786c191e6d33ae7585584a7e8090eb3e903511582ed7a71e6f5d26' 
  AND token = 'wvsezAoE8izhZjCsEJddP741dylzP8j8snvWpCLyqUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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