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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201851f650fdd872ae4ed4f68af8c14476ce24499e6ef7a388956793c59d08aa' 
  AND token = 'UY3nSSjD6hIrXCPY5O9mQZSvCkVJBceLoD1uKb4M7Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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