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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97aee05c21a39f58976dbdb70bfc47de0db1940b37057e18410e7743606796e6' 
  AND token = 'KAHxnzVxvbjX/CXPEaK4+7GbITr7cYgEZknD8e2uqr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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