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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572bef18b5e4bf4f506c30acc9d58f938b594e60be6cb6e82b51d33fdac3ad2f' 
  AND token = 'v3EvJcXVY0E8hgbpF0UsCXRtkEGraYQYflWv4xlWFYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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