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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75fa4e2b5b5421a57566e701ec3b0553ba5a29aa40ecec690c9f8dbfb0ebbaa' 
  AND token = 'uXCeC5DR1tpzyGzfvys0A2OI+ZTqu2lJ9i/rFY6JqKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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