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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab2201ea2f0d7a388f2619da5f1f6ac6119b1eee92845c42febdd86112163c' 
  AND token = 'PakqljoRod+b9pphmB6Ya+mUMtHQOvf7Du6shuxDn84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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