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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b5c0a21a49efe9cc09d1b5919fce2cf720815e80dbb5c37d41198a1e0aef84' 
  AND token = '7lwhnNoUTM5ATwROiZxozmpo+0zVCwNLiJsUxGTx27s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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