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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68587fb950dea0464a191c9c976f4a08453ac2b0a63b9d15fb3c4ee904b1c9f' 
  AND token = '70rfmgOk71XTEXk2AxNMs9UKHadvkFNKIQM5Zl4b1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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