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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7da76aad5ed59a57f9b48ce72d568c44c005fe7b23d877a1aa3d2f2bda00930' 
  AND token = 'hy6knvwdykHmDzyC2ajAIjVOZLqU92KYX5XrXVkEdMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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