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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd6224965fd1bad3de4430e27cebd1d248c4b74d9f3f1f9657c5c6094f919da' 
  AND token = 'SLDyyY1ItiU52ZJ0elOtnHLw2XW50vlqBFJXBNg20rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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