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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d98e197110d92d2abbe4aa39db93545d931a3bb92abdfb68e9805e81c2be59' 
  AND token = 'ZQVhUT9LBM82NYfZH50mYkorA0ROioqc34awQA9rKPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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