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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369b5f5077f833ea870b7ed5720235b93cd5cd316e3cb0100b863a2bf3067f19' 
  AND token = '/LYw3+67MYE0UCgYoXPVaf3/C8WN0BHbiDbbFff0Hhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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