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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9c4cce245da75376d0f50f745eed6ab39c5e80d43ee06cc42364649c0eeca7' 
  AND token = 'pZ5vq8bimIeK647Jazzg2E40RIiQZ8FiTmPpayE9KCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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