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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdaa3f63c601db5ccb7a6f4893876d1b27df0654b831d1dd69cc6ec2e7ff47a' 
  AND token = 'jFBkCFuQeZedmyHrLouRG5NDNicSKFLJvpWk1OBOw9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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