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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06701eac97c6905eaf67249d828ddc05ef20b901d8540015c2e8c1ef997e1456' 
  AND token = 'CJ/aMoCdcXgAckAAYnYu5D0gZZuVe1fK+PVj+E1cJD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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