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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f79f7c97c9020f4c4e5ede9e9458fdc7072882dc7b3ab48a34ea5760fcc3d0d' 
  AND token = 'NDwOgQ4Q0mhkIbhWrsc3BxlU3+GdrKj8u4Xe31RcsaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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