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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a4e7dbf2b5dfd65e3f6fb6305509727d8e35893fd8bf00cd1e9ab0cfe9a91e' 
  AND token = 'VKsELfCbXna6qfH/kRw16F91cPu3vC0pHq1oY54MwmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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