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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b9b6bc3dee13cc73335def834e46520f8f837eda0766bde266d386708dea5e' 
  AND token = 'S9ZZjtz9p66rUiLTaFD6XohBHjhekIlbJQkQXVZ7Qw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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