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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a9b8ec63aaad0b6f0d3b97be7c26624b7c666b1df9cf6f6c548657a12aef0d' 
  AND token = 'Evmga6VrjeXRSVZKw9bpG9JFDu5U3NoKm/2wxO8J0RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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