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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe087f698d38c6f1a91f3b96aeb1a365d6cd62f72c7936cfe21ce546736ea71' 
  AND token = '7pyCyba67K++nHONzhx21ZlL52PdEs1rvQVlNc+QBk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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