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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629af7681a58fc69b981c7ee8fc61b27100932c3668037ae2103ab384cefca80' 
  AND token = '15dPKwzouVKTJJ/zPsVWqxXjeOStPzc3vz9+nlgTvao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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