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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99dd1b5a0f316648207e029d90b38515109d8573488d0ed3a822097c09fc26cc' 
  AND token = 'EpeMM3as5O5UzybHjuNMIjZ+zAYpnb2mKvjAwCSDJv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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