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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ba7a72e69f8ed0b9afd20d54af35659d463446f70e47a79a1e77af6ff48281' 
  AND token = 'elUXRjHT80brWiVubwWYDJfXcN7cIUhND9yWZ/FXsAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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