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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2495d0ca8489761f75d28b0f82c26a946ff0f85c7b89e64030216e973ccf1e8b' 
  AND token = 'ggJXhAEd63rwIem2R55Kk/Lc0rtWcpqzu5ZylQSAl10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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