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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d3530b5ce0292a7e1ac5cecb56a9e0db3ce84b193b27269c45e6ec7b31a2c6' 
  AND token = 'FWX2bUly+Wasq2rK4AqfVF1fV3oZt7R34QnYpu7PQXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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