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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4109528299de2fbe2af9ea219931a713cdcf6932e73028b42d0afa00e0d37b' 
  AND token = '4S3x0yqXJxGiFYQ46/v5DUt1dNlD5lNO90OsssyqAVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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