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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206773b82cd215d10ae06741f37e26995bc64938cfe6ff446529f6242118f264' 
  AND token = '1NNGt3LV4n2rII/6mUtxnMKXRXTJBFVKlVuIRUckjrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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