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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5f6aaf5b1e2a3499215c891d1bbc9b77b443fb0912eaea0c3b57455ed9ce40' 
  AND token = '6kZowivr490S25DCFurbigAh1Ix1qSn3lZbzG9WH2uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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