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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4732065c111e45fe881709a33dafa9e71e923cc0696d882e54f587107eaf8d68' 
  AND token = '9wDRq1C+NQvtNZIL30E5/9y/5nPNdBM0YDGOX6SEzmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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