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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2c126a4980954a4414d25c111707f987062f183947535ba1c74e381ba71e40' 
  AND token = 'vgXIV1ZllMqbYxxzEkNco7qa2hWjl3tgDvdM/bhtlzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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