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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e97e9b6d3634b6a845d79a3c2318f89b5fd2dd7ec1f8095724203b74e4da03' 
  AND token = '7J0332JSjZRPRimqk5H/GAa0n+dZlw5u8/regcxTkdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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