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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bf7f9a2b180d03cb4cd2603b6f1c60388173a35c4171b890aeb64b8e8d87bc' 
  AND token = '0rbpHxlpJFY6MmyPfy9lQ1rhFey9hW4GWuGphnBXXf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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