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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c842d40a893b0d44901288b78e0bcb6b064b69f08083993583ae267ed811e5' 
  AND token = 'AtIcTS5voaaw+JhK+9Fj9TiDM9z7Ml5AXX6SMXx2L4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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