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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2852386fec28b0245e6494a8fec29ffc5f12ebcc16aabc0881e48e4d07192fd8' 
  AND token = 'jIKivn0DvoPEwVuVfNIX2bfkrByvZYyTApV6liYcB/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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