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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c959acac453b65f9721e9d2e4efeb07a98c6eb5a7e01e14d232cf5c67eec765d' 
  AND token = '4A5BkdhIAILQOZAvYfDbRJf0IjRtDCfaLZljKhkLvpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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