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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3520e46a5ed09913be16700b0432d5a06bd8c6049333c2a527492afe94b891ad' 
  AND token = 'tyc7mSRyVM5+iSpVwCXoNr+J8ioM5bGIwbeaYvmV4qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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