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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79f8c9784e56c5bddd7e43f22313172628bf1bfe327a7058161ae9bd2bb32e3' 
  AND token = 'hE6QIFVNJmuosuHm/Sd9AWIHDc2ukSormU0jTYiARrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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