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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfac991aa58fe54e2f4dc7342aaa52d81d0f81fdb9996f2ada16865393173a0' 
  AND token = 'au53d74gAzMyeTCI2kChEjDJG+7AQHxq4L1k8Tt1x+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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