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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fadd662e26409359c0e196e5c69d98c84e686eb277c2ba6cc1a2eb6ed6739a' 
  AND token = 'AfvXSgAMWjVHXTkZ2nKcgGTvoR/Hxk7o4ozKgzKtY/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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