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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7f4ddd5aafca2926ae4c555d26c9ba2defcd381fc1d5625257e4092818dcd1' 
  AND token = '9EtFyRlHHneDGCkJSX46Ltl7WGO2apWjZus87fUA4cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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