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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eeb2af09922efe773632d3f62103201cd6f5d4ff10d3d207d45bc93be761883' 
  AND token = 'Z4YRo+Vy99tOd2ZrKoGoKYOjPlbO8P77sTl0uK+Miw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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